You can only connect them to SPI components like the BME280 environment sensor, RC522 RFID module, and TFT display module. The I2C/TWI pins on the Micro are on D2 and D3. For Arduino beginners ...

[Pierre] recently bought his first car and decided to make his own RFID electric starter for it! An Arduino Nano controls two relays which in turn can turn the car on, start it, and turn it off.

Security researcher [Fran Brown] sent us this tip about his Tastic RFID Thief, which can stealthily ... 12 AA batteries and a custom PCB using an Arduino Nano to interpret the reader’s output.